add tainted_by_errors to mir::Body

compiler/rustc_const_eval/src/transform/check_consts/check.rs

@@ -120,7 +120,7 @@ impl<'mir, 'tcx> Qualifs<'mir, 'tcx> {
     fn in_return_place(
         &mut self,
         ccx: &'mir ConstCx<'mir, 'tcx>,
-        error_occured: Option<ErrorReported>,
+        tainted_by_errors: Option<ErrorReported>,
     ) -> ConstQualifs {
         // Find the `Return` terminator if one exists.
         //
@@ -134,7 +134,9 @@ impl<'mir, 'tcx> Qualifs<'mir, 'tcx> {
             .map(|(bb, _)| bb);
 
         let return_block = match return_block {
-            None => return qualifs::in_any_value_of_ty(ccx, ccx.body.return_ty(), error_occured),
+            None => {
+                return qualifs::in_any_value_of_ty(ccx, ccx.body.return_ty(), tainted_by_errors);
+            }
             Some(bb) => bb,
         };
 
@@ -166,7 +168,7 @@ impl<'mir, 'tcx> Qualifs<'mir, 'tcx> {
             needs_non_const_drop: self.needs_non_const_drop(ccx, RETURN_PLACE, return_loc),
             has_mut_interior: self.has_mut_interior(ccx, RETURN_PLACE, return_loc),
             custom_eq,
-            error_occured,
+            tainted_by_errors,
         }
     }
 }

compiler/rustc_const_eval/src/transform/check_consts/qualifs.rs

@@ -17,14 +17,14 @@ use super::ConstCx;
 pub fn in_any_value_of_ty<'tcx>(
     cx: &ConstCx<'_, 'tcx>,
     ty: Ty<'tcx>,
-    error_occured: Option<ErrorReported>,
+    tainted_by_errors: Option<ErrorReported>,
 ) -> ConstQualifs {
     ConstQualifs {
         has_mut_interior: HasMutInterior::in_any_value_of_ty(cx, ty),
         needs_drop: NeedsDrop::in_any_value_of_ty(cx, ty),
         needs_non_const_drop: NeedsNonConstDrop::in_any_value_of_ty(cx, ty),
         custom_eq: CustomEq::in_any_value_of_ty(cx, ty),
-        error_occured,
+        tainted_by_errors,
     }
 }
 

compiler/rustc_const_eval/src/transform/promote_consts.rs

@@ -974,6 +974,7 @@ pub fn promote_candidates<'tcx>(
             vec![],
             body.span,
             body.generator_kind(),
+            body.tainted_by_errors,
         );
 
         let promoter = Promoter {

compiler/rustc_middle/src/mir/mod.rs

@@ -13,6 +13,7 @@ use crate::ty::subst::{Subst, SubstsRef};
 use crate::ty::{self, List, Ty, TyCtxt};
 use crate::ty::{AdtDef, InstanceDef, Region, ScalarInt, UserTypeAnnotationIndex};
 
+use rustc_errors::ErrorReported;
 use rustc_hir::def::{CtorKind, Namespace};
 use rustc_hir::def_id::{DefId, CRATE_DEF_INDEX};
 use rustc_hir::{self, GeneratorKind};
@@ -284,6 +285,8 @@ pub struct Body<'tcx> {
 
     predecessor_cache: PredecessorCache,
     is_cyclic: GraphIsCyclicCache,
+
+    pub tainted_by_errors: Option<ErrorReported>,
 }
 
 impl<'tcx> Body<'tcx> {
@@ -297,6 +300,7 @@ impl<'tcx> Body<'tcx> {
         var_debug_info: Vec<VarDebugInfo<'tcx>>,
         span: Span,
         generator_kind: Option<GeneratorKind>,
+        tainted_by_errors: Option<ErrorReported>,
     ) -> Self {
         // We need `arg_count` locals, and one for the return place.
         assert!(
@@ -329,6 +333,7 @@ impl<'tcx> Body<'tcx> {
             is_polymorphic: false,
             predecessor_cache: PredecessorCache::new(),
             is_cyclic: GraphIsCyclicCache::new(),
+            tainted_by_errors,
         };
         body.is_polymorphic = body.has_param_types_or_consts();
         body
@@ -356,6 +361,7 @@ impl<'tcx> Body<'tcx> {
             is_polymorphic: false,
             predecessor_cache: PredecessorCache::new(),
             is_cyclic: GraphIsCyclicCache::new(),
+            tainted_by_errors: None,
         };
         body.is_polymorphic = body.has_param_types_or_consts();
         body

compiler/rustc_middle/src/mir/query.rs

@@ -228,7 +228,7 @@ pub struct ConstQualifs {
     pub needs_drop: bool,
     pub needs_non_const_drop: bool,
     pub custom_eq: bool,
-    pub error_occured: Option<ErrorReported>,
+    pub tainted_by_errors: Option<ErrorReported>,
 }
 
 /// After we borrow check a closure, we are left with various

compiler/rustc_middle/src/ty/structural_impls.rs

@@ -253,6 +253,7 @@ TrivialTypeFoldableAndLiftImpls! {
     crate::ty::UniverseIndex,
     crate::ty::Variance,
     ::rustc_span::Span,
+    ::rustc_errors::ErrorReported,
 }
 
 ///////////////////////////////////////////////////////////////////////////

compiler/rustc_mir_build/src/build/mod.rs

@@ -104,8 +104,8 @@ fn mir_build(tcx: TyCtxt<'_>, def: ty::WithOptConstParam<LocalDefId>) -> Body<'_
     let span_with_body = span_with_body.unwrap_or_else(|| tcx.hir().span(id));
 
     tcx.infer_ctxt().enter(|infcx| {
-        let body = if let Some(ErrorReported) = typeck_results.tainted_by_errors {
-            build::construct_error(&infcx, def, id, body_id, body_owner_kind)
+        let body = if let Some(error_reported) = typeck_results.tainted_by_errors {
+            build::construct_error(&infcx, def, id, body_id, body_owner_kind, error_reported)
         } else if body_owner_kind.is_fn_or_closure() {
             // fetch the fully liberated fn signature (that is, all bound
             // types/lifetimes replaced)
@@ -715,6 +715,7 @@ fn construct_error<'a, 'tcx>(
     hir_id: hir::HirId,
     body_id: hir::BodyId,
     body_owner_kind: hir::BodyOwnerKind,
+    err: ErrorReported,
 ) -> Body<'tcx> {
     let tcx = infcx.tcx;
     let span = tcx.hir().span(hir_id);
@@ -769,6 +770,7 @@ fn construct_error<'a, 'tcx>(
         vec![],
         span,
         generator_kind,
+        Some(err),
     );
     body.generator.as_mut().map(|gen| gen.yield_ty = Some(ty));
     body
@@ -857,6 +859,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
             self.var_debug_info,
             self.fn_span,
             self.generator_kind,
+            self.typeck_results.tainted_by_errors,
         )
     }
 

compiler/rustc_mir_transform/src/const_prop.rs

@@ -145,6 +145,7 @@ impl<'tcx> MirPass<'tcx> for ConstProp {
             Default::default(),
             body.span,
             body.generator_kind(),
+            body.tainted_by_errors,
         );
 
         // FIXME(oli-obk, eddyb) Optimize locals (or even local paths) to hold

compiler/rustc_mir_transform/src/lib.rs

@@ -252,8 +252,11 @@ fn mir_promoted<'tcx>(
     // Ensure that we compute the `mir_const_qualif` for constants at
     // this point, before we steal the mir-const result.
     // Also this means promotion can rely on all const checks having been done.
-    let _ = tcx.mir_const_qualif_opt_const_arg(def);
+    let const_qualifs = tcx.mir_const_qualif_opt_const_arg(def);
     let mut body = tcx.mir_const(def).steal();
+    if let Some(error_reported) = const_qualifs.tainted_by_errors {
+        body.tainted_by_errors = Some(error_reported);
+    }
 
     let mut required_consts = Vec::new();
     let mut required_consts_visitor = RequiredConstsVisitor::new(&mut required_consts);
@@ -358,13 +361,7 @@ fn mir_drops_elaborated_and_const_checked<'tcx>(
         return tcx.mir_drops_elaborated_and_const_checked(def);
     }
 
-    // (Mir-)Borrowck uses `mir_promoted`, so we have to force it to
-    // execute before we can steal.
-    if let Some(param_did) = def.const_param_did {
-        tcx.ensure().mir_borrowck_const_arg((def.did, param_did));
-    } else {
-        tcx.ensure().mir_borrowck(def.did);
-    }
+    let mir_borrowck = tcx.mir_borrowck_opt_const_arg(def);
 
     let is_fn_like = tcx.hir().get_by_def_id(def.did).fn_kind().is_some();
     if is_fn_like {
@@ -379,6 +376,9 @@ fn mir_drops_elaborated_and_const_checked<'tcx>(
 
     let (body, _) = tcx.mir_promoted(def);
     let mut body = body.steal();
+    if let Some(error_reported) = mir_borrowck.tainted_by_errors {
+        body.tainted_by_errors = Some(error_reported);
+    }
 
     // IMPORTANT
     pm::run_passes(tcx, &mut body, &[&remove_false_edges::RemoveFalseEdges]);
@@ -544,15 +544,13 @@ fn promoted_mir<'tcx>(
         return tcx.arena.alloc(IndexVec::new());
     }
 
-    if let Some(param_did) = def.const_param_did {
-        tcx.ensure().mir_borrowck_const_arg((def.did, param_did));
-    } else {
-        tcx.ensure().mir_borrowck(def.did);
-    }
-    let (_, promoted) = tcx.mir_promoted(def);
-    let mut promoted = promoted.steal();
+    let tainted_by_errors = tcx.mir_borrowck_opt_const_arg(def).tainted_by_errors;
+    let mut promoted = tcx.mir_promoted(def).1.steal();
 
     for body in &mut promoted {
+        if let Some(error_reported) = tainted_by_errors {
+            body.tainted_by_errors = Some(error_reported);
+        }
         run_post_borrowck_cleanup_passes(tcx, body);
     }
 

compiler/rustc_mir_transform/src/shim.rs

@@ -235,6 +235,8 @@ fn new_body<'tcx>(
         vec![],
         span,
         None,
+        // FIXME(compiler-errors): is this correct?
+        None,
     )
 }